Safdar Rahmatabadi was attacked by an unknown gunman while in his car in Sabalan square in eastern Tehran, IRNA reported on Sunday.
Rahmatabadi is said to have been shot in the chest and the head at about 19:50 local time (1620 GMT).
Police forces were present at the crime scene where an ambulance arrived for taking the body away.
“Investigations show that two bullets were fired at the victim from inside the car,” said a police officer, adding, “Since the shells of the two bullets were found in the car, most probably the attacker had been inside the car and talking to Mr. Rahmatabadi.”
The officer noted that there was no trace of conflict and battery at the crime scene.